18416561658 has 32 divisors (see below), whose sum is σ = 40201997760. Its totient is φ = 5577941760.

The previous prime is 18416561641. The next prime is 18416561663. The reversal of 18416561658 is 85616561481.

It is a self number, because there is not a number n which added to its sum of digits gives 18416561658.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61938 + ... + 201666.

It is an arithmetic number, because the mean of its divisors is an integer number (1256312430).

Almost surely, 2^18416561658 is an apocalyptic number.

18416561658 is an abundant number, since it is smaller than the sum of its proper divisors (21785436102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18416561658 is a wasteful number, since it uses less digits than its factorization.

18416561658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141742.

The product of its digits is 1382400, while the sum is 51.

The spelling of 18416561658 in words is "eighteen billion, four hundred sixteen million, five hundred sixty-one thousand, six hundred fifty-eight".